Spectacle-bridge.



G., H. BAY.. SPECTACLE BRIDGE. APPLICATIUN FILED JUNE 8. HHG.

Pamntd D60.. H, 19ML nvr/5mm@ EOTGE H. DAY",

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htlllhittlil lli. with?, @1F SOUTHBRIDGJE, MASSACHUSETTS. ASSIGNOR i130AIVJERCAN OPTICAL HUMPANY, F SOUTHBRIDG'E, MASSACHUSETTS, A. VULUNTARYASSOCIATION OF SPECTACLE-BIBEGE.

Application tiled .lune 8, 1916.

To all u1/'tom t may' concern:

Be it known that l, Guiones l-l. DAY, a citizen of the United States,residing at Southbridge, in the county of lllorcestcr and @tate ofMassachusetts, have invented certain neiv and useful improvements inSpectacle-Bridges, of Which the following is a specification.

My invention relates to improvements in spectacle bridges or the likeand has particular reference to an improved method or process of formingthe material for said bridges and of the production of an improveddurable completed article.

A. further object of my invention is the provision of a novelconstruction of spectacle bridge of gold-filled or similar n1aterialwhich shall be reinforced at those points having the greatest Wear Whileless heavily covered at the points requiring the covering for appearanceonly.

A further object of my invention is the accomplishment of the foregoingresults in such manner that there shall be no seams, joints or the likeon the surface of the co1npleted articleu @ther objects and advantagesof my improved construction should be readily apparent by reference tothe following description taken in connection With the accompanyingdrawings, and it Will be understood that l may make any modiiications inthe specific details of construction shown and described Within thescope of the appended claims Without departing from or exceeding thespirit of my invention..

Figure l represents a vievv of one form of completed spectacle bridgeconstructed in accordance with and embodying the principles of myinvention.

Fig. lll represents a central substantially horizontal sectional vieivthereof on an enlarged scale to most clearly bring out the essentialfeatures or advantages of my iinprovement.

lFig. lill represents a sectional View on the line lll-lll of Fig. Il.

llig. lV represents a view of the gold shell used in the formation ofthe Wire from which the bridge is constructed.

Fig. V represents an end view of the core..

Fig. Vl represents a vienT of the core and shell united before beingreduced.

llig. Vfl represents a sectional view of a Specification of LettersPatent.

Patented Dec. 11, 1917.

Serial No. 102,450.

frame or eye Wire constructed in accordance with this invention.

Fig. Vlllt represents a similar sectional vievv through the plainreduced wire adapted for example for a temple.

ln the drawings, in which similar characters of reference are employedto denote corresponding parts throughout the several views, the numerall designates as an entirety a bridge or lens connecting member for anophthalmic mounting, it being understood that While l have hereillustrated what is commonly termed in the art a saddle bridgeconstruction, my improvement is equally applicable to a t? bridge or anyother form of bridge, and that it can if desired likewise be employed inconnection with temples and other parts for ophthalmic mountings,although most particularly adapted for bridge constructions.

lt vvill be noted by reference to Fig. Il for eKample that this bridgehas a central arched portion adapted to iit around the nose with reverseforwardly bent portions secured to a frame or other lens retainingmember 2. It is, therefore, apparent that the greatest Wear on thebridge is liable to come on the inner face of the arch Where themounting rests against and has some slight movement up and down on thenose and Wear in being applied and removed, and a certain portion ofivear around the bends of the bridge due to the strain of the materialin the bending, the fact that these parts also have a certain engagementwith the face, and that they project and receive a certain amount ofWear when the mounting is laid dovvn, placed in a case or the like. Onthe other hand the portion Within the bends indicated by the numeral 3is protected from practically all Wear and needs the gold-filled coatsimply to cover the base metal and present an attractive appearance butis not subject to any seveie Wear. rlhe same can. practically be said tobe true of the outer tace of the arch of the bridge.

lit is, therefore, the primary purpose of the present invention toprovide a novel and improved bridge reinforced at these points of Wearand having a lighter coating at the points which are not subject to sogreat Wear so that the entire life of the mounting vvill beapproximately the same, and so that a greater value to thc consumer maybe provided for the same cost, in that in place of either a thin coatingall around which would not Wear long, or athick coating all the Wayaround, Which would be expensive, a thick coating is provided at thepoints of wear and the thin or less expensive coating at the parts notsubject. to so great Wear.

rlhe manner in Which this result is accomplished is believed to be mostclearly brought out in Figs. lV to Vl inclusive, from Which it will beseen that an ordinary base metal core Ll; of cylindrical form isemployed in the usual manner in connection with a seamless shell 5 ofgold. This gold shell, however, as is brought out in Figs. lV and Vl inplace of being 01"' the usual even tubular forni is constructed with abore of size to ust admit the core el but so arranged that the core ewill be located eccentric to the axis of the gold shell, this resultbeing accomplished by forming'the gold shell relatively thick on oneside as at 5, and relatively thin on the opposite side as at 5b. rlhegold shell having been so formed the core Ll is placed in it andsuitably secured as by the solder or uniting medium (l, as indicated inFig. Vl, and the stock then reduced from the heavy bar to the wireillustrated in Fig. lll, the Wire here being shown as slightly oval inform for purposes of construction of a bridge member such as shown inFig. l, the reduction having been equal on the bar so that in its finalform the Wire has the heavy portion 5a on one side ot it and the thinnerportion 5b on the opposite side surrounding the base metal core er. ltis then merely necessary to bend 'the bridge to complete any desiredlinal shaping of the Wire and bend it into shape when the bridge willhave the heavy or reinforced portion 5n on the inner side and thelighter portion 5b on the outer side.

l claim:

l. A spectacle bridge comprising a base metal core and a seamless goldshell thereon, said shell having a reinforced portion of uniformthickness disposed on the inner Jface of the bridge and having a portionof gradually decreasing thickness extending from the inner to the outerface ot thel bridge.

2. A Wire for the inanul'acture ol.E ophthalmic mountings or the like,comprising an inner base metal core and an outer seamless precious metalshell suitably connected` the inner Wall of the shell and outer uall olfthe core being coneentrically arranged and the outer Wall olf the shellbeing eccentric to the core whereby a thicker portion is provided at oneside of the wall, sulntantially as and for the purpose described.

3. As a nenv article of manufacture, a bridge member tor an ophthalmicvmounting.y comprising tn'o parts, an inner core member and a seamlessincasing shell therelor, the said shell. being initially eccentrieallylocated upon the core whereby in the finished product the bridge willpossess a` relatively thick precious metal shell on one side and arelatively thinner preciousl metal shell on the side exposed to lessn'ear, the thickened portion being` continuous for the length ot thepiece and the thickness oli the shell at various points being inconstant ratio to the diameter of the core, dillerent diameters of corehaving diliierent thicknesses ol' incasing shell therearomnl.

As a new article of manufacture. a reinforced litting tor an ophthalmicmount.- ing, comprisingv a base metal core member incased in actmtinuous precious metal shell which throughout the entire length olIthe member has a thick wall on one side ol the core and a thinner wallat the'diametrieally opposite side of the core.

A itting oit lilled material haring a seamless shell thicker on one sidethanon the other throughout the length ol the litting.

ln testimony whereof l allix my signature in the presence ot tn'ouitnesses.

GEORGE ll. D). Y. lVitnesses H. K. PARSONS,

Josnru J. Dmrnns.

Copies of this patent may be obtained for nire cents each. by addressingthe Commissioner of Patents, Washington, ID. C.

